xxxii COMPARATIVE ELECTRO-PHYSIOLOGY 



FIG. 1'AGE 



93. Photographic Record showing the nearly complete Abolition of 



Response by strong KOH 135 



94. Photographic Record showing the Stimulatory Action of Solution of 



Sugar 136 



95. Photographic Record showing Continuous Action of 2 per cent. 



Na,CO s Solution 136 



96. Photographic Record snowing the Depressing Action of 5 per cent. 



HC1 Acid 138 



97. Photographic Record showing Effect of I per cent. KHO . . . 138 



98. Photographic Record of Effect of 5 per cent. KHO . . . .139 



99. Striking-rods for stimulation of two ends of specimen and inducing 



phase-difference . . . . . . . . . . 143 



100. Isolated and diphasic responses with increasing difference of phase . 144 



1 01. Photographic Record showing Negative, Diphasic, and Positive 



Resultant Responses in Tin . . . . . . .146 



102. Photographic Records of Response of Bryophyllum . . . . 147 



103. Photographic Record of Response of Petiole of Cauliflower by the 



Diametric Method . . . . . . . . .147 



104. Distribution of Electrical Tension in Muscle-cylinder . . . . 150 



105. Photographic Record showing Persistent Electrical After-Effect in 



Inorganic Substance under Strong Stimulation . . . 151 



106. Photographic Record exhibiting Persistent Galvanometric Negativity 



in Plant Tissue after Strong Stimulation . . . . . 152 



107. Experimental Arrangement for determining Electrical Effect due to 



Section . . . . . . . . . . .154 



1 08. Records showing increasing Persistent Galvanometric Negativity, 



according as injury is caused nearer to proximal contact . . . 154 



109. Curve showing the Electrical Distribution in Stem with one Sectioned 



End 155 



no. Electrical Distribution in Plant-cylinder with Opposite Ends 



Sectioned 156 



in. Record of Responses in Plant (Leaf-stalk of Cauliflower) by Method 



of Negative Variation . . . . . . . .159 



112. Response by Positive Variation of Resting Current . . . . 165 



1 1 3. Distribution of Electric Potential in Lamina of Colocasia along a radial 



line from dead to living through intermediate stages . . .169 



114. Straight Form Potentiometer ....*... 171 



115. Distribution of Electric Potential in Petiole of Nytnph<ea alba, one 



end of which has been killed . . . . . . .172 



116. Photographic Records of Responses of Vegetable Nerve, one end of 



which has been injured ......... 175 



117. Typical Cases of Variation of Current of Rest and Action-Current. 



Specimen originally isotropic . . . . . . 175 



1 1 8. Typical Cases of Variation of Current of Rest and Action-Current ; 



intermediate point naturally less or more excitable than either of 

 terminal . . . . . . . . . . . 176 



119. Typical Cases of Variation of Current of Rest and Action Current. 



Anisotropic organ, B end originally more excitable than A . .177 



